This unit has been configured internally for 240v operation and is fully operational for UK use. I've fitted it with an inline female kettle socket, so a standard kettle plug lead plugs into it, (supplied). I have been using this unit for 5 years on a constant basis with no problems, very clean signal path & extremely versatile parametric controls.
The Ashly PQX 571 features balanced input & output but can be used with unbalanced input & output.
Ashly products are high quality US made devices.
Looking for £180 + £10 P&P.
From Sound on Sound Review
The PQX 571 is rather generous in the amount of EQ control provided; each channel has five independent parametric filters, plus two variable‑frequency shelving filters (one high‑pass and one low‑pass). Each filter section has its own bypass button with status LED, and there's also a master level control and master EQ In/Out button at the right of the front panel. A practical touch is the inclusion of a clip LED next to the master Level control, which comes on if any of the filter sections are being driven close to the point of clipping.
The high‑ and low‑pass sections appear to be 6dB/octave filters, and operate over the ranges 40Hz to 400Hz and 1.6kHz to 16kHz respectively. A dual concentric knob system is used where the inner knob alters the cut or boost (+/‑15dB) and the outer knob adjusts the shelving frequency.
All five parametric sections are identical, and all cover the frequency range 20Hz to 20kHz, though there is a x10 Range button which effectively provides two ranges: 20Hz to 2kHz and 200Hz to 20kHz. As with the shelving filters, a dual‑concentric knob system is used, this time to control the frequency and the bandwidth. The Bandwidth control covers the range 0.05 octaves to 3.3 octaves, and is calibrated in octaves rather than Q values, which makes it more intuitive to use. A separate Level control is used to set the degree of cut or boost within a +/‑15dB range. When an EQ section is switched in, a green LED comes on to provide visual confirmation.
Technically, the PQX 571 is pretty conventional, using state‑variable filters based around the 4558 op‑amp chip for each of the parametric sections. The same op‑amp is used for the shelving filters and for the electronic input balancing. All the circuitry is run from 18V rather than the more usual 15V, presumably to make the best use of the available headroom, and the general standard of design is up to the quality you'd expect from Ashly.
